So I was changing the strings on my JPXI earlier, and noticed that the rail was discoloured on the crunchlab where the gaps in the strings would be. The same thing is also happening on my other guitars with the crunchlab installed. It's proven quite hard to get a decent picture of it across the guitars. Hopefully you can see it in the pictures where I haven't circled it.

Now I am wondering is there anything I can do to fix this? Or prevent my naturally corrosive hands from doing this? Obviously wiping the guitar down after each use is a good way to prevent this, but I do that anyway, maybe I just haven't been thorough enough?

It's quite annoying for this to happen on a guitar that's not too old. I expected some wear and tear on the other two as they have been used heavily/gigged. But, these things happen. Any help would be appreciated.